FM_Radio_PICO

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FM Radio Project, RPI PICO RP2040 SDK C++

FM_Radio_PICO 최신버젼 다운로드

최종 버전 다운로드 (.zip)

// repository documentation

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Table of contents
---------------------------

* [Table of contents](#table-of-contents)
  * [Overview](#overview)
  * [Hardware](#hardware)
  * [Software](#software)
  * [Schematic](#schematic)
  * [Output](#sutput)

Overview
-------------------
* Name: FM_Radio_PICO
* Description:  FM stereo radio project for the RPI PICO.
* Developed on and for
	1. Raspberry pi PICO RP2040
	2. SDK C++ compiler G++ for arm-none-eabi
	3. CMAKE , VScode
	
![ ov](https://github.com/gavinlyonsrepo/FM_RADIO_PICO/blob/main/extra/images/overview.png)

Hardware
-------------------

The Radio Module used is a TEA5767NH. 
Headphones can be connected to the Audio out of the TEA5767 I2C module.
If the user wishes to drive  a speaker an Audio amplifier will be required like an LM386 module.
The ADC is used to read the volume  control of the Audio Amplifier module thru a voltage divider. Audio amplifier should not be powered at more than 5 volts. This gives us a volume indicator (of the amplified signal).

An OLED CH1115 is used as a screen for output connected by SPI.

Three push buttons are used for control , one more for reset.
1. Mute, select & access setting menu
2. Search up radio band & menus 
3. Search down radio band & menus.

An AHT10 12C sensor is read and it's data is displayed at bottom of screen.

As the TEA5767 is a 5 volt logic device(and PICO GPIO is 3.3V)  I connect to it through a voltage level shifter circuit. I had to use two separate buses for both I2C devices as they would not work reliably on same bus. The on-board PICO Status LED is also for basic status information.

![image ](https://github.com/gavinlyonsrepo/TEA5767_PICO/blob/main/extra/images/radio.jpg)

Software
-------------------
The libraries used are included. They can all also be found in stand alone format on my PICO projects list page [here. ](https://github.com/gavinlyonsrepo/RPI_PICO_projects_list)

Debug information can be printed to serial console (38400 baud) by changing setting.
The TEA5767 also has its own built-in separate debug prompt which can also be enabled
in the library.

On Startup a splash screen is displayed followed by a radio station selection menu. Here the user can select 
a radio station from a list by pressing mute button and navigate menu using search buttons.

The settings menu can be accessed by holding down the mute button for longer than 3 seconds 
It contains five settings currently , 1&2 define behaviour of search buttons,
3-5 define display mode.

1. Scan search and tune to stations automatically (default)
2. Fine tune search, Each press changes frequency by +/- 50 Khz
3. Display mode default 
4. Display Radio info only
5. Display Sensor data only , large text

Schematic
-------------------

1. "VIN" is the AUDIO out to the amplifier circuit for speaker if used. 
2. "Audio_ADJ" is from the volume control pot of amplifier circuit.
3. 5V Amplifier circuit not shown (TODO).

![ sch](https://github.com/gavinlyonsrepo/FM_RADIO_PICO/blob/main/extra/images/sch.png)

Output
------------------------
![ image ](https://github.com/gavinlyonsrepo/FM_RADIO_PICO/blob/main/extra/images/radiodata.jpg)

FM_Radio_PICO

FM_Radio_PICO 최신버젼 다운로드

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